Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hoc can » hoc dan, hoc cao, hoc cac
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ma hoi. hieu ve cac ((duc tan) or (hoc can)) hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ma hoi. hieu ve cac ((duc tan) OR (hoc can)) hanh vi ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ma hoi. hieu ve cac ((duc tan) or (hoc can)) hanh vi ((cua triet) or (su triet))*.